Thermo-Disc and Fan/Limit Control?

jedi_jackson Posted By jedi_jackson, Jan 30, 2019 at 6:06 AM

  1. jedi_jackson

    jedi_jackson
    New Member 2.
    NULL
    

    Jan 9, 2018
    6
    8
    Loc:
    Virginia
    I have a Thermo Pride WC-27 wood furnace and I'm new to wood furnaces and my furnace has a thermo-disc (snap disc) and a fan/limit control wired into the thermostat. Is this a normal set-up, or should it have one or the other? The fan/limit switch seems to be the one that is turning on my blower, but I don't know if the snap disc has any purpose wired with it.
     
  2. SuperSpy

    SuperSpy
    New Member 2.
    NULL
    

    Oct 12, 2017
    55
    13
    Loc:
    Michigan
    I think snap discs are usually just used as a safety measure in case the controller has a failure and gets stuck open. It's likely wired in series with the main power feed to the control circuitry, so as to "pull the plug" on the fan/air valves in case of an over temperature situation.
     
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